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Certificate related problems when using a web proxy server

I have several times encountered these issues, so it decided it was time to write a blog post about it. The situation You are using a proxy server for web communication. Direct communication to the Internet is blocked. The proxy Continue reading


Can disabling Delta CRL on a CA cause problems?

Imagine that you are using both Base CRL and Delta CRL, but you want to stop using Delta CRL and only use Base CRL going forward. Could this cause any problems in revocation checking if you do not carefully plan Continue reading


Internet Explorer and revocation check failure

Internet Explorer normally warns you if the server you visit have any certificate issues. Some examples: The certificate has another Subject than the URL you used to access it: The certificate was issued by a CA that your computer do Continue reading


Delete local CRL cache in Windows

Windows automatically caches retrieved CRLs and OCSP reponses. The advantage is that it speeds up revocation checking and uses less network bandwidth. The disadvantage is that clients will not detect new CRLs until the local cache expires. Normally you should Continue reading